One other thing i'd add to the list is, "If you don't know the answer to something, don't act like you do."

Nice, I'll remember it. THX.

Or you could just say, "What are your views on blah-blah-blah"...

I find the best way to sound more intelligent, sometimes, is to not speak at all.

I really agree with eric here. Never pretend to know more than you do, except maybe with your kids.